Development of the LOCA Analysis Code System of the ATR

Abstract

This report deals with the development of a thermal hydraulic code system for Loss-of-Coolant Accidents of the Advanced Thermal Reactor (ATR). The code system consists of the blowdown analysis codes for large Break LOCA (SENHOR) and Small Break LOCA (LOTRAC), the heatup code (HEATUP) and the reflooding code (FLOOD). Basic models within the codes have been developed and verified by separate effects tests for the important thermal hydraulic phenomena which are expected to occur during an accident in an ATR. The codes are composed of basic models, and have been verified by tests on integral facilities, changing the position and the size of the break.